Search Publications
HST observation of the inner coma of 2060 Chiron
Pasian, F.; Fulle, M.; Gil, A. Ortiz
The analysis of persistent comae of very large and distant comets allows us to infer the poorly known physical properties of dust and icy grains produced beyond Jupiter. Chiron is particularly interesting because Fulle ( Astron. Astrophys.282, 980-988; 1994) has shown that the strong asymmetricity of its coma (West, Astron. Astrophys.241, 635-645 …
The Latitudinal Gradient of Anomalous Cosmic Rays: Ulysses Observations
Marsden, R. G.; Trattner, K. J.
The Cooling of the White Dwarf in U Geminorum Following Hearing By Two Different Outbursts
Szkody, Paula; Sion, Edward M.; Huang, Min
We present the analysis of 13 orbital phase-resolved IUE (large and small aperture) SWP spectra, sampling the quiescent intervals of the prototype dwarf nova U Geminorum following two individual outbursts, the outburst of 1992, 29 August-14 September, and the outburst of 1993, 19 March-5 April. The quiescent interval following the outburst 29 Augu…
High Energy Cosmic Ray Results from the ULYSSES Ascent to the Solar South Pole
Sierks, H.; Kunow, H.; Wibberenz, G. +9 more
A search for planetary system candidates: Northern Nearby A Stars With Dust Disks And Circumstellar Gas
Cheng, Kwang-Ping; Neff, James E.
We report on our search for possible planetary system candidates in a volume-limited sample of 62 nearby A stars. Since the evolutionary lifetimes of A stars (≤ 109 yrs) roughly correspond to the era of planet formation and subsequent "heavy bombardment" in our solar system, our study could provide valuable insight into the origin of ou…
A spectroscopic study of the suspected chemically peculiar star HD210424.
Leone, F.; Manfre, M.; Catalano, F. A.
HD210424 is a suspected Chemically Peculiar star in The general catalogue of Ap and Am stars by Renson et al. (1991). To investigate if HD210424 is really a CP star, we obtained time-resolved high-resolution spectra of this star in the 482-513nm region. The Hbeta_ line can be matched by an ATLAS9 (Kurucz 1993) model with solar abundance…
Ion measurements in the jovian magnetosphere by the ULYSSES EPAC experiment: a comparison between dawn and dusk sectors
Franz, M.; Krupp, N.; Dougherty, M. K. +4 more
We report on results from the EPAC experiment on board the Ulysses spacecraft during the Jupiter Flyby in February 1992. We compare ion anisotropies (E = 0.24-0.77 MeV/N) received on the inbound pass in the noon sector at low magnetic latitudes with those from the outbound pass in the dusk sector at high magnetic latitudes. The results can be summ…
Study of distribution functions of interplanetary particles accelerated at co-rotating interaction region at∼5A.U.
Lanzerotti, L. J.; Maclennan, C. G.
We report the results of a study of the 12-hour average distribution functions of high Z nuclei as measured over a 10-day interval on the Ulysses spacecraft at a helioradius of∼5.2 A.U. We use the good time and atomic mass resolution of the composition aperture of the HI-SCALE instrument to determine the form of the distribution functions for C, O…
The Evolution of the Anomalous Component of the Cosmic Rays During the ULYSSES Mission
Sanderson, T. R.; Marsden, R. G.; Trattner, K. J. +1 more
We have studied the evolution of the anomalous cosmic ray component at ULYSSES using observations of the quiet time helium fluxes obtained with the COSPIN Low Energy Telescope during the years from launch in October 1990 to the latest data in 1994. Shown are preliminary results of measurements in the energy range from 4.0 to 19 MeV/n. Following th…
Modulation recovery of high energy electrons: ULYSSES observations
Sierks, H.; Kunow, H.; Heber, B. +5 more
The ULYSSES spacecraft, launched in Oct 1990 near solar maximum, continues its investigation journey toward the southern polar pass during the decaying phase of solar cycle 22. One of the primary aim of its mission, namely the study of the cosmic-ray solar modulation in the three-dimensional heliosphere, has really started when exploring high latt…